What does it mean when someone is nearsighted?

Nearsightedness, also known as myopia, is a common vision condition where distant objects appear blurred, while close objects appear clear. It occurs when the shape of the eye is too long, or the cornea (the clear, curved front cover of the eye) is too curved, causing light to focus in front of the retina (the light-sensitive tissue at the back of the eye) instead of directly on it. As a result, distant objects appear blurry.

Nearsighted people may squint or眯眼to try to see distant objects more clearly. They may also experience headaches, eyestrain, or fatigue from excessive squinting. Nearsightedness typically begins in childhood and can progress over time. Early detection and proper correction with eyeglasses, contact lenses, or refractive surgery can help prevent complications and maintain good vision.